Inturn you twist your wrist in to you, causing the rock to go to the right. Out turn you twist your wrist away from you, causing the rock to go left.
I'll take a stab at the second question but I'm not 100% sure...the pebbles get worn out, but not much, so there is a little less curl at the end of a game...I think this is right, but I could be completely out to lunch.
Edit---Baha, this thing finally made it to the 50th page! Thank god haha.
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